Especially undergraduates may want to use general databases: ProQuest, EBSCO, Wilson 's Omnifile . Some scholarly journals are included, and some titles will be present in full-text for searching, printing or downloading. Also notable is GREENR (Gale) Global reference on environment, energy and natural resources.
* Note: the ProQuest databases have a checkbox under Document Type, for vetted websites.
See other databases listed in the Environment subject grouping under “Articles and Databases”, which might be relevant depending upon the emphasis.